AD9856SLASHPCB datasheet(9/37 Pages) AD

9 / 37 page

AD9856

Rev. C | Page 8 of 36

TYPICAL PERFORMANCE CHARACTERISTICS

TYPICAL MODULATED OUTPUT SPECTRAL PLOTS

–80

–72

–64

–56

–48

–40

–32

–24

–16

–8

STOP 50MHz

START 0Hz

5MHz/

REF LVL

–25dBm

RBW

VBW

SWT

10dB

dBm

RF ATT

UNIT

10kHz

1kHz

12.5s

1AP

Figure 3. QPSK at 42 MHz and 2.56 MS/sec; 10.24 MHz External Clock with

REFCLK Multiplier = 12, CIC = 3, HB3 On, 2× Data

–80

–72

–64

–56

–48

–40

–32

–24

–16

–8

STOP 40MHz

START 0Hz

4MHz/

REF LVL

–30dBm

RBW

VBW

SWT

10dB

dBm

RF ATT

UNIT

10kHz

1kHz

10s

1AP

Figure 4. 64-QAM at 28 MHz and 6 MS/sec; 36 MHz External Clock with

REFCLK Multiplier = 4, CIC = 2, HB3 Off, 3× Data

–80

–72

–64

–56

–48

–40

–32

–24

–16

–8

STOP 80MHz

START 0Hz

8MHz/

REF LVL

–25dBm

RBW

VBW

SWT

10dB

dBm

RF ATT

UNIT

10kHz

1kHz

20s

1AP

Figure 5. 16-QAM at 65 MHz and 2.56 MS/sec; 10.24 MHz External Clock with

REFCLK Multiplier = 18, CIC = 9, HB3 Off, 2× Data

–80

–72

–64

–56

–48

–40

–32

–24

–16

–8

STOP 50MHz

START 0Hz

5MHz/

REF LVL

–30dBm

RBW

VBW

SWT

10dB

dBm

RF ATT

UNIT

10kHz

1kHz

12.5s

1AP

Figure 6. 256-QAM at 38 MHz and 6 MS/sec; 48 MHz External Clock with

REFCLK Multiplier = 4, CIC = 2, HB3 Off, 4× Data

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